Out of the following which one is an example of dynamic equilibrium ?
(1) Moon revolving around the earth
(2) A pebble fixed at the end of a string whirling in a circular path
(3) An aeroplane moving at a constant height
(4) A beam balance balanced in a horizontal position.
(a) (3) and (4)
(b) (1), (2) and (3)
(c) (1) and (2)
(d) (1) and (3)
Rohit Academy Changed status to publish June 24, 2025
(b) (1), (2) and (3)
Explanation: Dynamic equilibrium refers to a condition where a body is in motion, but the net force and net torque acting on it is zero. The object moves with constant velocity (no acceleration). Forces acting on the body are balanced.
Rohit Academy Changed status to publish June 24, 2025